American Hegemony is a double edged sword. There is undoubtedly much ill action that has been taken by U.S. businesses and branches of the government in protection of this global dominance. I am not denying that and you'd have to find a pretty ignorant American that doesn't recognize these facts.

-------BUT-------

That Hegemony has also ensured that there is, for the most part, free and fair trade throughout much of the world with many international organizations and conventions such as the OECD, CSCE, Democracy/Economy building NGOs, etc.. (Obviously these aren't perfect, but they are at least an attempt to check exploitation and corruption).

If/When American Hegemony ends, the power vacuum will most likely allow regional powers such as China, Russia, and Iran to exert their political will and they have not demonstrated much to show that they would do a better job that the U.S. has.

Again, I appreciate the cynicism that the U.S. has rightfully deserved when it comes to foreign policy, but the hegemony has also leant itself to a 70 year period without a major destructive war of powers and has done a passable job at dealing with international conflicts and crises.

It is not realistic. It is cynical to the extreme to assume that the main motives behind every action a country takes are driven by some nefariously machiavellian policy. When a country acts there will always be external factors and motivations, but that does not mean that you can just discredit all actions of a country because it has had a checkered past or there are some small elements that benefit from tragedy and disaster. Show me one country free of sin and I'll show you a country that doesn't exist.